If you link up to Flickr images, and then make a change, even if you re-upload in place. I understand the technological reason behind it, but I also know that they could create permanent redirects and route all of those links through those, just like, oh, Bit.ly does. But they haven’t, and if you’re someone who has a tendency to go in and rework images, well, Flickr can become a bucket of pain. The good news: a good link tester spider wandering your site will find these. The bad news: you have to actually understand the phrase I just wrote.
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